Give info and warnings about the TERM environment variable

tools/check_term.py

@@ -0,0 +1,41 @@
+#!/usr/bin/env python
+#
+# Copyright 2019 Espressif Systems (Shanghai) PTE LTD
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from __future__ import print_function
+import os
+import sys
+
+if __name__ == '__main__':
+    # Checks for the content of environment variable TERM to use with the Python- and curses-based menuconfig. It is
+    # not implemented in shell so calling this script could not use some other shell environment where TERM is set
+    # differently. Implemented here so it could be checked at one place for make and cmake as well.
+    if sys.platform == 'win32' and 'MSYSTEM' not in os.environ:
+        # no TERM is used in Windows command line
+        exit(0)
+
+    term = os.environ.get('TERM', None)
+
+    if term is None:
+        print('WARNING: The TERM environment variable is not defined. The curses-based menuconfig '
+              'will probably fail to run. Please consult the documentation of your terminal to set it up.')
+    else:
+        if term.endswith('256color'):
+            print('TERM environment variable is set to "{}"'.format(term))
+        else:
+            print('WARNING: Menuconfig may fail because of the TERM environment variable is set '
+                  'to "{}". Please consult the documentation of your terminal to set it up. '
+                  'Some good, proved to been working setups include xterm-256color, screen-256color, '
+                  'rxvt-unicode-256color.'.format(term))